ML20129D308

Submits Station Blackout Modeling in Probalistic Safety Analysis for Proposed Standby Diesel Generator License Amendments,South Texas Project,Units 1 & 2

ML20129D308
Person / Time
Site:	South Texas
Issue date:	09/24/1996
From:	Alexion T NRC
To:	NRC
References
TAC-M92169, TAC-M92170, NUDOCS 9609300035
Download: ML20129D308 (2)

Text

.- _

4 September 24, 1996 j

l MEMORANDUM T0:

PDIV-I File FROM:

Tom Alexion

SUBJECT:

STATION BLACK 0UT MODELING IN THE PROBABILISTIC SAFETY ANALYSIS FOR PROPOSED STANDBY DIESEL GENERATOR LICENSE AMENDMENTS, SOUTH TEXAS PROJECT, UNITS 1 AND 2 (STP)

(TAC NOS. M92169 AND M92170)

I received tho attached fax from John Flack, who received it from the licensee.

l Docket No. 50-498 and 50-499 l

Attachment:

Fax from Licensee DISTRIBUTION:

Docket File PUBLIC (PDR)

TAlexion l

D0C. NAME: STP92169

)

l l

DE Di ' /

NRC ftE CENTER COPY 3aeeis 9609300035 960924 PDR ADOCK 05000498 P

PDR

00/10 '06 13:21 ID STP,HL&P NUCLEAR ENG FAX:072808' PACE 2

o ISBO_ INT 1.XLWJDG_SBO XLS l

.L

..... Station Blockout (880) Contibution 1

i l

initiatore used to calculate 880 j

i i

LOSP Loss of 345kV Offrite Power LOMT Loss of PoWor ffom Mein Iransformer LOSPX Loss of all Offs!ts Power TLOSP Loss of 34SkV Power 1

)

1 TLOSPX Loss of 345kV & 138kV, P.o._wer I

Fre.quency of Sequences for:

Base Case SBO 3.73E-06

,Bese Ceee PDS 2.07 E-05

!D21 AOT SBO I 5.28E-OS l

ID21AOT PDS

! 2.30E-05 4

i j

ID14RV1 iSBO l 4.40E 06

' ' " ~"

I

'fD14RV1 7PDS 2.18E 057 i

I I

! Percent increasifor SSO Freipiency from Base Ne~e

~

~

~

D21 AO.T i

'41.81} _ _..

_.q Percent increase for PDS Frequency from Bose Caos

'D21 AOT 10.09 4

i

'D14RV1

.. 5.28 j

I

.,880 Percent of Database l

4 IBase Case f

18.01 D21 AOT 23.03 i

D14RV1 1

20.18 cNes

//faclc l W ' $ e N t e n o*b 0 Q*J 'e

$1se C a a,,.

-y

()2 i (\\ en rt Nod <l < 9 tes m W o z.s Cay sam & /

d' b j'j @ \\/ l D Nfoht f ft ft+Lc M tv l'/ h y

.Std m;'k /

Sho

%L b h,A Pb 5

-9 C o. < e Dwee Fee

-c acm ISBO_ INT 1.XLW)DG_SBO.XLS 9/18/96 ATTACHMENT